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Heat transfer at pool boiling of mixtures with R22 and R114.

Author(s) : GORENFLO D., BLEIN P., HERRES G., et al.

Type of article: Article, IJR article

Summary

The phase equilibrium and the heat transfer coefficient, at pool boiling were measured with eight mixtures and the pure components of the system R22(CHFzCI)-Rl14(C2F4C12). The saturation pressure varied between the critical pressure of each mixture and about 20% of this pressure. The critical line of the system deviates less than 1 K from the molar average of the critical temperatures of the pure components but reaches pressures up to about 2 bar higher than the molar average of the critical pressures. The difference between the compositions ofvapour and liquid is found to be greatest at about 35 mol% of R22 in the liquid and at the lowest saturation pressure investigated. The difference vanishes at the critical line. As is known from the literature about pool boiling of mixtures, the heat transfer coefficient decreases below the corresponding molar average of the heat transfer coefficients for the pure components, the effect becoming more and more pronounced when the saturation pressure approaches the critical pressure. Furthermore, the dependence of ~t on heat flux and saturation pressure is less with the mixtures than with the pure components. A comparison with correlating techniques for ct in the literature shows a comparatively good agreement with a correlating method proposed by Schliinder.

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Pages: 257-263

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Details

  • Original title: Heat transfer at pool boiling of mixtures with R22 and R114.
  • Record ID : 30001612
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 11 - n. 4
  • Publication date: 1988/07

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